A unified OLED aging model combining three modeling approaches for extending AMOLED lifetime
A unified OLED aging model combining three modeling approaches for extending AMOLED lifetime
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DOI：
10.1002/jsid.1064
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发表时间：
2021-06-02
影响因子：
2.3
通讯作者：
Xu, Chihao
中科院分区：
文献类型：
--
作者：
Jiang, Xingtong;Xu, Chihao
有机发光二极管（OLED）显示屏的老化问题一直是OLED显示屏面临的最大挑战，它会导致有源矩阵有机发光二极管（AMOLED）显示屏出现图像残留伪影，从而限制其使用寿命。为了克服这个缺点，老化模型是必要的，以补偿老化的文物。在本文中，我们提出了一个统一的OLED老化模型，它结合了三个可行的建模方法，即数据计数，电光和相关的方法。该模型可用于预测OLED像素在操作期间的效率衰减。它减轻了这三种模型的弱点和局限性，并分别部署了它们的优势。在第一个老化阶段中，数据计数模型被优先化，在后面的阶段中，使用相关性模型对其进行校准。效率衰减对OLED工作点的依赖性由电光模型覆盖。统一的模型是基于现象和物理效应。它提供了更高的可靠性，以确定OLED在长期操作和宽操作范围（如电流幅度和/或温度范围）内的退化。统一老化模型适用于模拟或数字驱动方案。基于老化模型的相应补偿可以应用于延长AMOLED寿命。
Aging is still the most challenging issue for organic light-emitting diodes (OLEDs), which causes the image-sticking artifacts on active-matrix organic light-emitting diode (AMOLED) displays and limits their lifetime. To overcome this demerit, an aging model is necessary to compensate for aging artifacts. In this paper, we present a unified OLED aging model, which combines three feasible modeling approaches of OLED degradation, namely, data-counting, electro-optical, and correlation methods. The model can be used to predict the efficiency decay of OLED pixels during operation. It mitigates weaknesses and limitations of each of these three models and deploys their strengths, respectively. In the first aging stage, the data-counting model is prioritized, and in the later stages, it is calibrated using the correlation model. The dependency of the efficiency decay on the operation point of OLED is covered by the electro-optical model. The unified model is based on both phenomenal and physical effects. It delivers more reliability to determine an OLED's degradation over a long-term operation and a wide operation range like current amplitude and/or temperature range. The unified aging model applies to either an analog or a digital driving scheme. A corresponding compensation based on the aging model can be applied for extending the AMOLED lifetime.